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Thanks,

Chris

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- Thread starter kq6up
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- #1

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Thanks,

Chris

- #2

A.T.

Science Advisor

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Velocity doesn't even appear in Newton's second law.With my understanding of Newton's second -- if I am going to use it to solve a problem, I would need to write ALL velocities in the system with respect to the lab frame (inertial rest frame) -- correct?

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Chris

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A.T.

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What, you have there is acceleration and average acceleration, which of course can be expressed in terms of velocity.It does in the rocket problem. ##\dot{p}=\dot{m}v+m\dot{v}=F_{thrust}##. Also, if you are calculating the the change in momentum over some time interval ##F=m\frac{\Delta v}{\Delta t}##.

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